EP0210619A2 - Heat-embossable multilayered film, and method of making it - Google Patents

Heat-embossable multilayered film, and method of making it Download PDF

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Publication number
EP0210619A2
EP0210619A2 EP86110357A EP86110357A EP0210619A2 EP 0210619 A2 EP0210619 A2 EP 0210619A2 EP 86110357 A EP86110357 A EP 86110357A EP 86110357 A EP86110357 A EP 86110357A EP 0210619 A2 EP0210619 A2 EP 0210619A2
Authority
EP
European Patent Office
Prior art keywords
layer
lacquer
spatial pattern
film
layers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86110357A
Other languages
German (de)
French (fr)
Other versions
EP0210619A3 (en
EP0210619B1 (en
Inventor
Werner Dr. Reinhart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leonhard Kurz Stiftung and Co KG
Original Assignee
Leonhard Kurz GmbH and Co KG
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Filing date
Publication date
Application filed by Leonhard Kurz GmbH and Co KG filed Critical Leonhard Kurz GmbH and Co KG
Priority to AT86110357T priority Critical patent/ATE52963T1/en
Publication of EP0210619A2 publication Critical patent/EP0210619A2/en
Publication of EP0210619A3 publication Critical patent/EP0210619A3/en
Application granted granted Critical
Publication of EP0210619B1 publication Critical patent/EP0210619B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C3/00—Processes, not specifically provided for elsewhere, for producing ornamental structures
    • B44C3/08—Stamping or bending
    • B44C3/085—Stamping or bending stamping
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
    • G06K19/14—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by radiation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
    • G06K19/16—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being a hologram or diffraction grating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0276—Replicating a master hologram without interference recording
    • G03H1/028—Replicating a master hologram without interference recording by embossing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/916—Fraud or tamper detecting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24521—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24612—Composite web or sheet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2848—Three or more layers

Definitions

  • the invention relates to a multilayer film, in particular a hot stamping film, consisting of a carrier film, a decorative layer comprising at least one lacquer layer and having a spatial pattern, preferably a diffraction-optical structure, and optionally an adhesive layer arranged on the side of the decorative layer facing away from the carrier film.
  • a multilayer film in particular a hot stamping film, consisting of a carrier film, a decorative layer comprising at least one lacquer layer and having a spatial pattern, preferably a diffraction-optical structure, and optionally an adhesive layer arranged on the side of the decorative layer facing away from the carrier film.
  • a process for the production of such foils a first lacquer layer being applied to the carrier foil, this then being provided with the spatial pattern and then a second lacquer layer being applied.
  • a foil in particular a hot stamping foil, which is equipped with a spatial pattern.
  • a spatial pattern can be a diffraction-optically effective structure, preferably a hologram, by means of which very specific optical effects, be it when irradiated with natural or be irradiated with artificial light of a certain wavelength, can be generated.
  • it is necessary to take the spatial pattern exactly and to transfer it to the counterfeit foil. This is only possible if the lacquer layer that generally covers the spatial pattern is removed.
  • an identification card formed from a laminate which has two layers with different optical transmission or different colors.
  • the adjacent surfaces of these two layers are provided with complementary, mutually matching impressions or elevations.
  • the two layers are then pressed together under pressure and heat, which causes the layers to be welded in the area of the interface, thus creating a uniform map.
  • the impressions or elevations corresponding to the thickness of the layers are comparatively high, namely so high that when the two layers are joined, the elevations or depressions snap into one another.
  • the layers are individually provided with the elevations or depressions and then placed one on top of the other such that the elevations or depressions snap into one another.
  • holograms were generally introduced into embossing foils in such a way that a metallized layer was present, into which the hologram or the other structure having an optical diffraction effect was then embossed.
  • the metal layer provided with the structure was then covered with a protective lacquer layer, although lacquers were chosen which, on the one hand, adhered very well to the metal layer, and on the other hand were hardly or only very difficult to dissolve with conventional solvents. Nevertheless, counterfeiters have repeatedly succeeded in exposing the surface of the spatial pattern.
  • the invention is based on the object of further improving the security against forgery of such multilayer foils, in particular hot stamping foils with a structure having an optical diffraction effect, in that exposure of the spatial pattern is practically excluded.
  • a method for the simple production of corresponding films is to be proposed.
  • the decorative layer comprises at least two alsratfo having j restrictive, of transparent coatings significantly different optical properties lacquer layers formed, the interface forms the spatial pattern and the means of chemical or physical Methods cannot be separated.
  • the spatial patterning is therefore no longer applied to a metal layer which is very different in structure and behavior from the conventional lacquer layers, but is instead according to the invention between two lacquer layers, these lacquer layers in order to make the spatial pattern visible.
  • the lacquer layers should be selected so that they cannot be separated from one another by chemical or physical methods. In order to prevent chemical separation, it must therefore be a lacquer which basically has the same composition. The separation using physical methods can be prevented by choosing lacquers for the two lacquer layers which create a chemical bond between them, for example lacquers which have not yet crosslinked or only gradually reacting organic groups. With a foil acc.
  • the invention it is practically impossible that when trying to fake or remove the spatial pattern for the purpose of falsification, the interface between the two layers of lacquer, which have the spatial pattern, is properly exposed. A direct removal of the spatial pattern from the original film is therefore excluded, which means that films are safe to be washed. the invention compared to the previously common films is increased significantly.
  • the decorative layer comprises a non-translucent, preferably metal layer, which on the surface of the carrier film facing away from the the spatial patterning lacquer layers is arranged.
  • the non-translucent or metal layer due to the reflection or absorption of the incident light occurring at it, enhances the contrasts in the area of the boundary layer exhibiting the spatial pattern compared to a film in which only the two lacquer layers forming the interface have different optical properties.
  • the invention provides that when the film is produced, before the complete drying or curing of the first layer of paint, it is provided with the spatial pattern and the second layer of paint is applied. According to the invention, the second lacquer layer is thus applied before the first lacquer layer has completely dried or cured. This procedure strongly encourages the formation of bonds between the two layers of lacquer, so that particularly good adhesion is achieved in the area of the interface with the spatial pattern.
  • the film according to FIG. 1 comprises, in a manner known per se, a carrier film 1, for example a polyester film with a thickness of approximately 19 ⁇ m.
  • a release layer 2 for example a wax-like layer or a special lacquer layer, is provided on the carrier film 1.
  • the release layer 2 is adjoined by a decorative layer, denoted overall by 3, which consists of a first lacquer layer 4, a second lacquer layer 5, each in a thickness of approximately 1-5 ⁇ m, and a metal layer 6, for example vapor-deposited.
  • the decorative layer 3 can be detached from the carrier film 1, for example under the action of heat and pressure, and is in use by means of an adhesive layer 7, e.g. Can be 0.2 to 0.7 ⁇ m thick, attached to the object to be decorated or protected, for example a credit card made of plastic.
  • the adhesive layer 7 can be formed by a hot glue or by a special lacquer which becomes sticky when heated.
  • the interface 8 between the two layers of paint 4 and 5 is provided with a spatial pattern.
  • the spatial patterning of the interface 8 is e.g. around a structure with optical diffraction, preferably a so-called "hoiogram".
  • the lacquers 4 and 5 of the decorative layer 3 are transparent on the one hand so that the spatial pattern or structure of the interface 8 is visible. On the other hand, they have clearly different optical properties, preferably very different refractive indices.
  • the spatial pattern for the formation of the interface 8 is introduced in a manner known per se from the manufacture of stamping foils either in a lifting process or in a rolling process.
  • Two different options are provided for producing the film, namely either a so-called dry texturing or a wet texturing.
  • a lacquer is applied to the carrier film 1 and at least largely dried.
  • the spatial pattern is then introduced into this first lacquer in a lifting or rolling process.
  • the second layer of lacquer is then applied.
  • a varnish of the following composition can be used as the first varnish, which is applied over the entire area with a basis weight of 2.5 to 3.0 g / m 2 to the carrier film:
  • the lifting method is used, for example, to work with a surface pressure of 1 ton / cm 2 , a temperature of 110 ° C. and a pressure duration of 0.4 sec. If a roll-off process is used for the introduction of the spatial pattern, line pressure of 150 kp / cm, a temperature of approximately 110 ° C and a running speed of the roll or film with the lacquer of 15 m / min. be worked.
  • the second lacquer layer is also applied over the entire area with a basis weight of 1.0 to 1.5 g / m 2 , it being possible, for example, to use the following lacquer:
  • the layers of the lacquers A and B are connected by crosslinking between the incompletely hardened constituents of the two lacquer layers subsequent to the application of the second lacquer layer, as a result of which a practically non-releasable connection is produced in the area of the interface 8.
  • the application of the first lacquer layer is shown schematically in FIG. 2.
  • the first lacquer layer 4 'and optionally the release layer 2 are applied to the carrier film 1' in a manner known per se, for example in a gravure printing process.
  • the carrier film 1 'with the first lacquer layer 4' then runs over the surface of a spatially patterned 9, chilled and co-rotating roller 10, that the first lacquer layer 4 'points to the spatial pattern 9 and thus when running over the roller 10 accordingly Formation of the boundary layer 8 'is textured.
  • the carrier film 1 'with the lacquer layer 4' is pressed against the textured roller 10 by means of a rubber roller 11.
  • the carrier film 1 'with the lacquer layer 4' forming the interface 8 'then runs to the textured roller 10 via a detaching roller 13, as a result of which the carrier film 1' with the lacquer layer 4 'is detached from the textured roller 10.
  • Figure 2 with the first lacquer layer 4 'film is then carried out in such a way that a further layer of a curable lacquer is applied to the lacquer layer 4' by gravure printing, the final hardening of the two lacquer layers 4 ', 5 then depending on their composition either by renewed UV radiation or heat.
  • varnishes B and D which are each curable by means of UV radiation
  • varnish E a crosslinking polyurethane varnish:
  • lacquer E thermal curing must take place, for example in a drying cabinet at a temperature of about 70 to 80 ° C. for 12 hours.
  • the metal layer 6 can then optionally also be applied, for example by vacuum evaporation, but also by sputtering. It would also be conceivable to provide colored layers of paint, etc.
  • the film is then finished by applying the adhesive layer 7.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Holo Graphy (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

In a foil which has a three-dimensional patterning, the patterning effect is provided between two layers of lacquer which, by virtue of the composition thereof, cannot be readily separated from each other by chemical or physical means in order thereby to prevent the patterning from being removed for fraudulent purposes.

Description

Die Erfindung betrifft eine mehrlagige Folie, insbesondere Heißprägefolie, bestehend aus einer Trägerfolie, einer mit einer räumlichen Musterung, vorzugsweise einer beugungsoptisch wirksamen Struktur, versehenen, mindestens eine Lackschicht umfassenden Dekorschicht sowie gegebenenfalls einer auf der der Trägerfolie abgekehrten Seite der Dekorschicht angeordneten Klebeschicht. Außerdem befaßt sie sich mit einem Verfahren zur Herstellung von derartigen Folien, wobei auf die Trägerfolie eine erste Lackschicht aufgebracht, diese dann mit der räumlichen Musterung versehen und anschließend eine zweite Lackschicht aufgebracht wird.The invention relates to a multilayer film, in particular a hot stamping film, consisting of a carrier film, a decorative layer comprising at least one lacquer layer and having a spatial pattern, preferably a diffraction-optical structure, and optionally an adhesive layer arranged on the side of the decorative layer facing away from the carrier film. In addition, it is concerned with a process for the production of such foils, a first lacquer layer being applied to the carrier foil, this then being provided with the spatial pattern and then a second lacquer layer being applied.

Es ist bekannt, zur Verbesserung der Fälschungssicherheit von Dokumenten, beispielsweise Scheckkarten, Kreditkarten, Sparkassenbüchem oder ähnlichen Sicherheitsträgem diese mit einer Folie, insbesondere einer Heißprägefolie, zu versehen, welche mit einer räumlichen Musterung ausgestattet ist. Beispielsweise kann es sich bei einer solchen räumlichen Musterung um eine beugungs optisch wirksame Struktur, vorzugsweise ein Hologramm, handeln, mittels dessen ganz bestimmte optische Effekte, sei es bei Bestrahlung mit natürlichem, sei es bei Bestrahlung mit Kunstlicht bestimmter Wellenlänge, erzeugt werden können. Um derartige Sicherungsfolien zu fälschen, ist es erforderlich, die räumliche Musterung genau abzunehmen und auf die gefälschte Folie zu übertragen. Dies ist nur möglich, wenn die im allgemeinen die räumliche Musterung überdeckende Lackschicht entfernt wird.It is known to improve the security against forgery of documents, for example check cards, credit cards, savings bank books or similar security carriers, to provide them with a foil, in particular a hot stamping foil, which is equipped with a spatial pattern. For example, such a spatial pattern can be a diffraction-optically effective structure, preferably a hologram, by means of which very specific optical effects, be it when irradiated with natural or be irradiated with artificial light of a certain wavelength, can be generated. In order to counterfeit such security foils, it is necessary to take the spatial pattern exactly and to transfer it to the counterfeit foil. This is only possible if the lacquer layer that generally covers the spatial pattern is removed.

Aus der US-PS 4 469 725 is eine aus einem Laminat gebildete Identifikationskarte bekannt, welche zwei Schichten mit unterschiedlicher optischer Durchlässigkeit bzw. verschiedener Farbe aufweist. Die benachbarten Oberflächen dieser beiden Schichten sind mit komplementären, ineinander passenden Einprägungen bzw. Erhebungen versehen. Bei der Herstellung werden die beiden Schichten dann unter Druck und Wärme aneinander gedrückt, wodurch eine Verschweissung der Schichten im Bereich der Grenzfläche erfolgt und so eine einheitliche Karte entsteht. Bei dieser bekannten Karte sind die Einprägungen bzw. Erhebungen entsprechend der Dicke der Schichten vergleichsweise hoch, und zwar so hoch, dass beim Zusammenfügen der beiden Schichten die Erhebungen bzw. Vertiefungen ineinander rasten. Zur Herstellung werden jeweils die Schichten einzeln mit den Erhebungen bzw. Vertiefungen versehen und dann so aufeinander gelegt, dass die Erhebungen bzw. Vertiefungen ineinander rasten. Ein solches Vorgehen ist verständlicherweise bei der Erzeugung von Prägefolien wegen deren im Vergleich zu den Schichten der bekannten Karte geringen Dicke nicht möglich. Ausserdem sind die Strukturen, die beu gungsoptisch wirksam sind, so fein, dass ein Verrasten zweier getrennt, mit zueinander passend profilierten Oberflächen hergestellten Schichten niemals möglich wäre.From US Pat. No. 4,469,725, an identification card formed from a laminate is known, which has two layers with different optical transmission or different colors. The adjacent surfaces of these two layers are provided with complementary, mutually matching impressions or elevations. During production, the two layers are then pressed together under pressure and heat, which causes the layers to be welded in the area of the interface, thus creating a uniform map. In this known card, the impressions or elevations corresponding to the thickness of the layers are comparatively high, namely so high that when the two layers are joined, the elevations or depressions snap into one another. For the production, the layers are individually provided with the elevations or depressions and then placed one on top of the other such that the elevations or depressions snap into one another. Such a procedure is understandably not possible when producing stamping foils because of their small thickness compared to the layers of the known card. In addition, the structures that have an optical diffraction effect are so fine that it would never be possible to lock two separate layers that were produced with matching profiled surfaces.

Bisher wurde bei der Einbringung von Hologrammen in Prägefolien im allgemeinen so vorgegangen, daß eine metallisierte Schicht vorhanden war, in die dann das Hologramm bzw. die sonstige beugungsoptisch wirksame Struktur eingeprägt wurde. Die mit der Struktur versehene Metallschicht wurde dann mit einer Schutzlackschicht abgedeckt, wobei man zwar Lacke gewählt hat, die zum einen sehr gut an der Metallschicht hafteten, zum anderen auch mit üblichen Lösungsmittels kaum oder nur sehr schwer auflösbar waren. Trotzdem ist es Fälschern immer wieder gelungen, die Oberfläche der räumlichen Musterung freizulegen.In the past, holograms were generally introduced into embossing foils in such a way that a metallized layer was present, into which the hologram or the other structure having an optical diffraction effect was then embossed. The metal layer provided with the structure was then covered with a protective lacquer layer, although lacquers were chosen which, on the one hand, adhered very well to the metal layer, and on the other hand were hardly or only very difficult to dissolve with conventional solvents. Nevertheless, counterfeiters have repeatedly succeeded in exposing the surface of the spatial pattern.

Der Erfindung liegt nun die Aufgabe zugrunde, die Fälschungssicherheit von solchen mehrlagigen Folien, insbesondere Heißprägefolien mit einer beugungsoptisch wirksamen Struktur, weiter zu verbessern, indem eine Freilegung der räumlichen Musterung praktisch ausgeschlossen wird. Gleichzeitig soll ein Verfahren zur einfachen Herstellung entsprechender Folien vorgeschlagen werden.The invention is based on the object of further improving the security against forgery of such multilayer foils, in particular hot stamping foils with a structure having an optical diffraction effect, in that exposure of the spatial pattern is practically excluded. At the same time, a method for the simple production of corresponding films is to be proposed.

Zur Lösung dieser Aufgabe wird nach der Erfindung bei der eingangs erwähnten Folie nun vorgeschlagen so vorzugehen, daß die Dekorschicht mindestens zwei aufeinanderfojgende, von transparenten Lacken deutlich unterschiedlicher optischer Eigenschaften gebildete Lackschichten aufweist, deren Grenzfläche die räumliche Musterung bildet und die mittels chemischer oder physikalischer Methoden nicht voneinander trennbar sind.To achieve this object, according to the invention in the above-mentioned film now proposed to proceed so that the decorative layer comprises at least two aufeinanderfo having j restrictive, of transparent coatings significantly different optical properties lacquer layers formed, the interface forms the spatial pattern and the means of chemical or physical Methods cannot be separated.

Die räumliche Musterung ist also bei der Folie nach der Erfindung nicht mehr auf einer hinsichtlich ihrer Struktur und Verhaltensweise von den üblichen Lackschichten stark verschiedenen Metallschicht angebracht, sondern sie befindet sich erfindungsgemäß zwischen zwei Lackschichten, wobei diese Lackschichten, um die räumliche Musterung sichtbar zu machen, deutlich unterschiedliche optische Eigenschaften aufweisen, vorzugsweise stark unterschiedliche Brechungsindizes besitzen. Zusätzlich sollen die Lackschichten noch so gewählt sein, daß sie sich mittels chemischer oder physikalischer Methoden nicht voneinander trennen lassen. Es muß sich also, um eine chemische Trennung zu verhindern, um Lacke handeln, die prinzipiell die gleiche Zusammensetzung haben. Die Trennung mittels physikalischer Methoden kann dadurch verhindert werden, daß für die beiden Lackschichten Lacke gewählt werden, die zwischen sich eine chemische Bindung hervorrufen, beispielsweise Lacke, die noch nicht vernetzte oder erst allmählich reagierende, organische Gruppen aufweisen. Bei einer Folie gem. der Erfindung ist es praktisch ausgeschlossen, daß beim Versuch der Fälschung bzw. der Abnahme der räumlichen Musterung zum Zwecke der Fälschung die Grenzfläche zwischen den beiden Lackschichten, die die räumliche Musterung aufweisen, ordentlich freigelegt wird. Eine direkte Abnahme der räumlichen Musterung von der ursprünglichen Folie ist somit ausgeschlossen, wodurch die Fläschungssicherheit von Folien gern. der Erfindung gegenüber den bisher geläufigen Folien ganz wesentlich erhöht wird.In the film according to the invention, the spatial patterning is therefore no longer applied to a metal layer which is very different in structure and behavior from the conventional lacquer layers, but is instead according to the invention between two lacquer layers, these lacquer layers in order to make the spatial pattern visible. have clearly different optical properties, preferably have very different refractive indices. In addition, the lacquer layers should be selected so that they cannot be separated from one another by chemical or physical methods. In order to prevent chemical separation, it must therefore be a lacquer which basically has the same composition. The separation using physical methods can be prevented by choosing lacquers for the two lacquer layers which create a chemical bond between them, for example lacquers which have not yet crosslinked or only gradually reacting organic groups. With a foil acc. the invention it is practically impossible that when trying to fake or remove the spatial pattern for the purpose of falsification, the interface between the two layers of lacquer, which have the spatial pattern, is properly exposed. A direct removal of the spatial pattern from the original film is therefore excluded, which means that films are safe to be washed. the invention compared to the previously common films is increased significantly.

Um die räumliche Musterung bzw. die beugungsoptisch wirksame Struktur auch für das bloße Auge sichtbar zu machen, kann es günstig sein, wenn bei der Folie nach der Erfindung die Dekorschicht eine nicht durchscheinende, vorzugsweise Metallschicht umfaßt, die auf der der Trägerfolie abgekehrten Fläche der zwischen sich die räumliche Musterung bildenden Lackschichten angeordnet ist. Die nicht durchscheinende bzw. Metallschicht verstärkt infolge der an ihr auftretenden Reflexion bzw. Absorption des einfallenden Lichtes die Kontraste im Bereich der die räumliche Musterung aufweisenden Grenzschicht im Vergleich zu einer Folie, bei der lediglich die beiden die Grenzfläche bildenden Lackschichten unterschiedliche optische Eigenschaften aufweisen.In order to make the spatial pattern or the diffraction-optically effective structure visible to the naked eye, it can be advantageous if, in the film according to the invention, the decorative layer comprises a non-translucent, preferably metal layer, which on the surface of the carrier film facing away from the the spatial patterning lacquer layers is arranged. The non-translucent or metal layer, due to the reflection or absorption of the incident light occurring at it, enhances the contrasts in the area of the boundary layer exhibiting the spatial pattern compared to a film in which only the two lacquer layers forming the interface have different optical properties.

Für die beiden Lackschichten können alle möglichen Lacke eingesetzt werden. Eine besonders sichere Haftung im Bereich der Grenzfläche ergibt sich jedoch, wie festgestellt wurde, dann, wenn die die räumliche Musterung bildenden Lackschichten von durch UV-Strahlung vemetzbaren Acrylat-Lacken, von durch Wärme vemetzenden Polyurethan-Lacken oder einem Gemisch dieser Lacke gebildet sind, und zwar vor allem deswegen, weil bei diesen Lacken eine graduelle Aushärtung bzw. Trocknung erfolgen kann, wobei während des Härtungsvorganges eine Bin dung der beiden Lackschichten im Bereich der Grenzfläche eintritt.All possible paints can be used for the two paint layers. However, as has been established, there is a particularly reliable adhesion in the area of the interface if the lacquer layers forming the spatial pattern are formed by acrylate lacquers which can be crosslinked by UV radiation, by polyurethane lacquers which crosslink by heat, or a mixture of these lacquers. This is mainly because these varnishes can be cured or dried gradually, with a bond between the two varnish layers occurring in the area of the interface during the curing process.

Zur Herstellung von Folien, insbesondere Heißprägefolien, ist es allgemein geläufig, auf die Trägerfolie eine erste Lackschicht aufzubringen, diese dann mit einer räumlichen Musterung zu versehen und anschließend eine zweite Lackschicht aufzubringen. Die räumliche Musterung befindet sich dabei allerdings bisher auf einer die erste Lackschicht abdeckenden Metallschicht, so daß die beiden Lackschichten nicht direkt aufeinanderfolgen. Um nun eine möglichst gute Fälschungssicherheit, d.h. ein zuverlässiges Haften der beiden Lackschichten aneinander zu erreichen, ist erfindungsgemäß vorgesehen, daß bei der Herstellung der Folie vor der vollständigen Trocknung bzw. Aushärtung der ersten Lackschicht diese mit der räumlichen Musterung versehen und die zweite Lackschicht aufgebracht wird. Erfindungsgemäß erfolgt also die Aufbringung der zweiten Lackschicht bevor die erste Lackschicht vollständig getrocknet bzw. ausgehärtet ist. Durch dieses Vorgehen wird das Entstehen von Bindungen zwischen den beiden Lackschichten stark begünstigt, so daß man eine besonders gute Haftung im Bereich der die räumliche Musterung aufweisenden Grenzfläche erreicht.For the production of foils, in particular hot stamping foils, it is generally common to apply a first lacquer layer to the carrier foil, then to provide this with a spatial pattern and then to apply a second lacquer layer. The spatial pattern has so far been located on a metal layer covering the first lacquer layer, so that the two lacquer layers do not follow one another directly. In order to ensure the best possible protection against counterfeiting, i.e. To achieve reliable adhesion of the two layers of paint to one another, the invention provides that when the film is produced, before the complete drying or curing of the first layer of paint, it is provided with the spatial pattern and the second layer of paint is applied. According to the invention, the second lacquer layer is thus applied before the first lacquer layer has completely dried or cured. This procedure strongly encourages the formation of bonds between the two layers of lacquer, so that particularly good adhesion is achieved in the area of the interface with the spatial pattern.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung eines Ausführungsbeispiels einer erfindungsgemäßen Folie sowie eines Herstellungsverfahrens anhand der Zeichnung. Es zeigen:

  • Fig. 1 einen Schnitt durch eine Folie nach 'der Erfindung und
  • Fig. 2 schematisiert einen Ausschnitt aus einer Vorrichtung zur Herstellung von erfindungsgemäßen Folien.
Further features, details and advantages of the invention result from the following description of an exemplary embodiment of a film according to the invention and of a production method with reference to the drawing. Show it:
  • Fig. 1 shows a section through a film according to the '' invention and
  • Fig. 2 schematically shows a section of an apparatus for producing films according to the invention.

Die Folie nach Figur 1 umfaßt in an sich bekannter Weise eine Trägerfolie 1, beispielsweise eine Polyesterfolie mit einer Dicke von etwa 19 um. Auf der Trägerfolie 1 ist eine Ablöseschicht 2, beispielsweise eine wachsartige Schicht oder eine spezielle Lackschicht vorgesehen. An die Ablöseschicht 2 schließt eine insgesamt mit 3 bezeichnete Dekorschicht an, die aus einer ersten Lackschicht 4, einer zweiten Lackschicht 5, jeweils in einer Dicke von etwa 1-5 um, sowie einer beispielsweise aufgedampften Metallschicht 6 besteht.The film according to FIG. 1 comprises, in a manner known per se, a carrier film 1, for example a polyester film with a thickness of approximately 19 μm. A release layer 2, for example a wax-like layer or a special lacquer layer, is provided on the carrier film 1. The release layer 2 is adjoined by a decorative layer, denoted overall by 3, which consists of a first lacquer layer 4, a second lacquer layer 5, each in a thickness of approximately 1-5 μm, and a metal layer 6, for example vapor-deposited.

Die Dekorschicht 3 kann beispielsweise unter Einwirkung von Wärme und Druck von der Trägerfolie 1 abgelöst werden und wird im Gebrauch mittels einer Klebeschicht 7, die z.B. 0,2 bis 0,7 um stark sein kann, an dem zu dekorierenden bzw. zu schützenden Gegenstand, beispielsweise einer aus Kunststoff bestehenden Kreditkarte befestigt. Die Klebeschicht 7 kann von einem Heißkleber oder von einem speziellen, bei Erwärmung klebrig werdenden Lack gebildet sein.The decorative layer 3 can be detached from the carrier film 1, for example under the action of heat and pressure, and is in use by means of an adhesive layer 7, e.g. Can be 0.2 to 0.7 µm thick, attached to the object to be decorated or protected, for example a credit card made of plastic. The adhesive layer 7 can be formed by a hot glue or by a special lacquer which becomes sticky when heated.

Wie in Figur 1 schematisch angedeutet, ist die Grenzfläche 8 zwischen den beiden Lackschichten 4 und 5 mit einer räumlichen Musterung versehen. Es handelt sich bei der räumlichen Musterung der Grenzfläche 8 z.B. um eine beugungsoptisch wirksame Struktur, vorzugsweise ein sogenanntes "Hoiogramm".As indicated schematically in Figure 1, the interface 8 between the two layers of paint 4 and 5 is provided with a spatial pattern. The spatial patterning of the interface 8 is e.g. around a structure with optical diffraction, preferably a so-called "hoiogram".

Damit die räumliche Musterung bzw. Struktur der Grenzfläche 8 sichtbar ist, sind die Lacke 4 und 5 der Dekorschicht 3 zum einen transparent. Zum anderen besitzen sie deutlich unterschiedliche optische Eigenschaften, vorzugsweise stark unterschiedliche Brechungsindizes.The lacquers 4 and 5 of the decorative layer 3 are transparent on the one hand so that the spatial pattern or structure of the interface 8 is visible. On the other hand, they have clearly different optical properties, preferably very different refractive indices.

Die Einbringung der räumlichen Musterung zur Ausbildung der Grenzfläche 8 erfolgt in an sich von der Herstellung von Prägefolien bekannter Weise entweder in einem Hubverfahren oder in einem Abrollverfahren.The spatial pattern for the formation of the interface 8 is introduced in a manner known per se from the manufacture of stamping foils either in a lifting process or in a rolling process.

Zur Herstellung der Folie sind zwei verschiedene Möglichkeiten vorgesehen, nämlich entweder eine sogenannte Trockentexturierung oder eine Naßtexturierung.Two different options are provided for producing the film, namely either a so-called dry texturing or a wet texturing.

Bei der Trockentexturierung wird ein Lack auf die Trägerfolie 1 aufgebracht und zumindest weitgehend getrocknet. In diesen ersten Lack wird dann in einem Hub-oder Abrollverfahren die räumliche Musterung eingebracht. Anschließend erfolgt dann die Aufbringung der zweiten Lackschicht.During the dry texturing, a lacquer is applied to the carrier film 1 and at least largely dried. The spatial pattern is then introduced into this first lacquer in a lifting or rolling process. The second layer of lacquer is then applied.

Als erster Lack kann für die Trockentexturierung ein Lack folgender Zusammensetzung verwendet werden, der ganzflächig mit einem Flächengewicht von 2,5 bis 3,0 g/m2 auf die Trägerfolie aufgebracht wird:

Figure imgb0001
For the dry texturing, a varnish of the following composition can be used as the first varnish, which is applied over the entire area with a basis weight of 2.5 to 3.0 g / m 2 to the carrier film:
Figure imgb0001

Bei Einbringung der Texturierung in die aus dem Lack A gebildete Lackschicht wird im Hubverfahren beispielsweise mit einem Flächendruck von 1 Tonne/cm2, einer Temperatur von 110°C und einer Druckdauer von 0,4 sec. gearbeitet. Sofern ein Abrollverfahren für die Einbringung der räumlichen Musterung zur Anwendung kommt, kann mit einem Liniendruck von 150 kp/cm, einer Temperatur von etwa 110°C und einer Laufgeschwindigkeit der Rolle bzw. Folie mit dem Lack von 15 m/min. gearbeitet werden.When the texturing is introduced into the lacquer layer formed from lacquer A, the lifting method is used, for example, to work with a surface pressure of 1 ton / cm 2 , a temperature of 110 ° C. and a pressure duration of 0.4 sec. If a roll-off process is used for the introduction of the spatial pattern, line pressure of 150 kp / cm, a temperature of approximately 110 ° C and a running speed of the roll or film with the lacquer of 15 m / min. be worked.

Die zweite Lackschicht wird ebenfalls ganzflächig mit einem Flächengewicht von 1,0 bis 1,5 g/m2 aufgebracht, wobei beispielsweise folgender Lack verwendet werden kann:

Figure imgb0002
The second lacquer layer is also applied over the entire area with a basis weight of 1.0 to 1.5 g / m 2 , it being possible, for example, to use the following lacquer:
Figure imgb0002

Die Verbindung der Schichten aus den Lacken A und B erfolgt durch Vernetzung zwischen den nicht vollständig ausgehärteten Bestandteilen der beiden Lackschichten anschließend an die Aufbringung der zweiten Lackschicht, wodurch eine praktisch nicht lösbare Verbindung im Bereich der Grenzfläche 8 entsteht.The layers of the lacquers A and B are connected by crosslinking between the incompletely hardened constituents of the two lacquer layers subsequent to the application of the second lacquer layer, as a result of which a practically non-releasable connection is produced in the area of the interface 8.

Sofern ein rascheres Arbeiten gewünscht ist, wird im Wege der Naßtexturierung gearbeitet. Die Aufbringung der ersten Lackschicht ist dabei - schematisch in Fig. 2 dargestellt. Die erste Lackschicht 4' und gegebenenfalls die Ablöseschicht 2 werden in an sich bekannter Weise, beispielsweise in einem Tiefdruckverfahren auf die Trägerfolie 1' aufgetragen. Die Trägerfolie 1' mit der ersten Lackschicht 4' läuft dann so über die Oberfläche einer eine räumliche Musterung 9 aufweisenden, gekühtten und mitgedrehten Walze 10, daß die erste Lackschicht 4' zur räumlichen Musterung 9 weist und somit beim Lauf über die Walze 10 entsprechend zur Ausbildung der Grenzschicht 8' texturiert wird. Die Trägerfolie 1' mit der Lackschicht 4' wird mittels einer Gummiwalze 11 gegen die texturierte Walze 10 angepreßt. Während der weiteren Umschlingung der texturierten Walze 10 durch die Trägerfolie 1' mit der Lackschicht 4' erfolgt, wie durch die Pfeile 12 angedeutet, eine Bestrahlung mit UV-Strahlen, und zwar von der Rückseite der Trägerfolie 1' hindurch, was bedeutet, daß die UV-Strahlung 12 nach entsprechender Schwächung in der Trägerfolie 1' die Lackschicht 4' erreicht. Wenn die Trägerfolie 1' aus Polyestermaterial besteht, ist im allgemeinen davon auszugehen, daß nur Strahlung mit einer Wellenlänge von mehr als 360 nm durchgelassen wird, wodurch nur eine teilweise Härtung des durch UV-Strahlung härtbaren Lackes 4' erfolgt.If faster work is desired, wet texturing is used. The application of the first lacquer layer is shown schematically in FIG. 2. The first lacquer layer 4 'and optionally the release layer 2 are applied to the carrier film 1' in a manner known per se, for example in a gravure printing process. The carrier film 1 'with the first lacquer layer 4' then runs over the surface of a spatially patterned 9, chilled and co-rotating roller 10, that the first lacquer layer 4 'points to the spatial pattern 9 and thus when running over the roller 10 accordingly Formation of the boundary layer 8 'is textured. The carrier film 1 'with the lacquer layer 4' is pressed against the textured roller 10 by means of a rubber roller 11. During the further wrapping of the textured roller 10 through the carrier film 1 'with the lacquer layer 4', as indicated by the arrows 12, an irradiation with UV rays takes place, namely from the back of the carrier film 1 ', which means that the UV radiation 12 reaches the lacquer layer 4 'after corresponding weakening in the carrier film 1'. If the carrier film 1 'consists of polyester material, it can generally be assumed that only radiation with a wavelength of more than 360 nm is transmitted, as a result of which the UV-curable lacquer 4' is only partially cured.

Die Trägerfolie 1' mit der die Grenzfläche 8' bildenden Lackschicht 4' läuft anschließend an die texturierte Walze 10 über eine Ablösewalze 13, wodurch die Trägerfolie 1' mit der Lackschicht 4' von der texturierten Walze 10 gelöst wird.The carrier film 1 'with the lacquer layer 4' forming the interface 8 'then runs to the textured roller 10 via a detaching roller 13, as a result of which the carrier film 1' with the lacquer layer 4 'is detached from the textured roller 10.

Die Fertigstellung der gern. Figur 2 mit der ersten Lackschicht 4' versehenen Folie erfolgt dann derart, daß auf die Lackschicht 4' im Tiefdruckverfahren eine weitere Schicht eines härtbaren Lackes aufgetragen wird, wobei dann die endgültige Härtung der beiden Lackschichten 4', 5 abhängig von deren Zusammensetzung entweder durch erneute UV-Bestrahlung oder durch Wärmeeinwirkung erfolgt.The completion of the like. Figure 2 with the first lacquer layer 4 'film is then carried out in such a way that a further layer of a curable lacquer is applied to the lacquer layer 4' by gravure printing, the final hardening of the two lacquer layers 4 ', 5 then depending on their composition either by renewed UV radiation or heat.

Für die Naßtexturierung können folgende Lacke eingesetzt werden:

  • Für die erste Lackschicht 4' ein Lack C, der ganzflächig mit einem Flächengewicht von 1,5 bis 2,0 g/m' aufgetragen wird:
    Figure imgb0003
  • Für die zweite Lackschicht ist ein Lack D, dessen Auftrag ebenfalls ganzflächig ist, z.B. im Tiefdruckverfahren, mit einem Flächengewicht von 1.0 bis 1,5 g/m2 erfolgt.
Figure imgb0004
 The following varnishes can be used for wet texturing:
  • For the first lacquer layer 4 ', a lacquer C which is applied over the entire area with a basis weight of 1.5 to 2.0 g / m':
    Figure imgb0003
  • For the second layer of lacquer there is a lacquer D, the application of which is also over the entire surface, for example by gravure printing, with a basis weight of 1.0 to 1.5 g / m 2 .
Figure imgb0004

Anstelle der vorstehend erläuterten Lacke B und D, die jeweils mittels UV-Strahlung härtbar sind, wäre es auch möglich, folgenden Lack E, einen vernetzenden Polyurethan-Lack, einzusetzen:

Figure imgb0005
Bei Verwendung des Lackes E muß eine thermische Härtung, beispielsweise in einem Trockenschrank bei einer Temperatur von etwa 70 bis 80"C während 12 Stunden, erfolgen.Instead of the varnishes B and D explained above, which are each curable by means of UV radiation, it would also be possible to use the following varnish E, a crosslinking polyurethane varnish:
Figure imgb0005
 When using lacquer E, thermal curing must take place, for example in a drying cabinet at a temperature of about 70 to 80 ° C. for 12 hours.

Wenn die beiden Lackschichten 4, 5 auf die Trägerfolie 1 aufgebracht sind, kann dann gegebenenfalls noch die Metallschicht 6, beispielsweise durch Vakuum-Aufdampfen, aber auch durch Sputtering, aufgebracht werden. Es wäre auch denkbar, farbige Lackschichten vorzusehen etc.. Die Folie wird dann durch Aufbringung der Klebeschicht 7 fertiggestellt.If the two lacquer layers 4, 5 are applied to the carrier film 1, the metal layer 6 can then optionally also be applied, for example by vacuum evaporation, but also by sputtering. It would also be conceivable to provide colored layers of paint, etc. The film is then finished by applying the adhesive layer 7.

Claims (5)

1. Mehrlagige Folie, insbesondere Heißprägefolie, bestehend aus einer Trägerfolie, einer mit einer räumlichen Musterung, vorzugsweise einer beugungsoptisch wirksamen Struktur, versehenen, mindestens eine Lackschicht umfassenden Dekorschicht sowie gegebenenfalls einer auf der der Trägerfolie abgekehrten Seite der Dekorschicht angeordneten Klebeschicht,
dadurch gekennzeichnet,
daß die Dekorschicht (3) mindestens zwei aufeinanderfolgende, von transparenten Lacken deutlich unterschiedlicher optischer Eigenschaften gebildete Lackschichten (4, 5) aufweist, deren Grenzfläche - (8) die räumliche Musterung bildet und die mittels chemischer oder physikalischer Methoden nicht voneinander trennbar sind.1. multilayer film, in particular hot stamping film, consisting of a carrier film, a decorative layer comprising at least one lacquer layer and having a spatial pattern, preferably a diffraction-optical structure, and optionally an adhesive layer arranged on the side of the decorative layer facing away from the carrier film,
characterized,
that the decorative layer (3) has at least two successive lacquer layers (4, 5) formed by transparent lacquers with significantly different optical properties, the boundary surface of which (8) forms the spatial pattern and which cannot be separated from one another by chemical or physical methods. 2. Folie nach Anspruch 1, dadurch gekennzeichnet, daß die die räumliche Musterung (8) bildenden Lackschichten (4, 5) von Lacken mit stark unterschiedlichem Brechungsindex gebildet sind.2. Film according to claim 1, characterized in that the spatial pattern (8) forming lacquer layers (4, 5) are formed by lacquers with a very different refractive index. 3. Folie nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dekorschicht (3) eine nicht durchscheinende, vorzugsweise Metallschicht (6) umfaßt, die auf der der Trägerfolie (1) abgekehrten Fläche der zwischen sich die räumliche Musterung (8) bildenden Lackschichten (4, 5) angeordnet ist3. A film according to claim 1 or 2, characterized in that the decorative layer (3) comprises a non-translucent, preferably metal layer (6) on the surface of the carrier film (1) facing away from the lacquer layers forming the spatial pattern (8) between them (4, 5) is arranged 4. Folie nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die die räumliche Musterung - (8) bildenden Lackschichten (4,5) von durch UV-Strahlung vemetzbaren Acrylat-Lacken, von durch Wärme vernetzenden Polyurethan-Lacken oder einem Gemisch dieser Lacke gebildet sind.4. A film according to claim 1 or 2, characterized in that the spatial pattern - (8) forming lacquer layers (4,5) of UV-crosslinkable acrylate lacquers, of heat-crosslinking polyurethane lacquers or a mixture of these lacquers are formed. 5. Verfahren zur Herstellung von Folien nach einem der vorhergehenden Ansprüche, wobei auf die Trägerfolie eine erste Lackschicht aufgebracht, diese dann mit der räumlichen Musterung versehen und anschließend eine zweite Lackschicht aufgebracht wird, dadurch gekennzeichnet, daß vor der vollständigen Trocknung bzw. Aushärtung der ersten Lackschicht diese mit der räumlichen Musterung versehen und die zweite Lackschicht aufgebracht wird.5. A process for the production of films according to any one of the preceding claims, wherein a first layer of lacquer is applied to the carrier film, this is then provided with the spatial pattern and then a second layer of lacquer is applied, characterized in that the first is completely dried or cured Paint layer this with the spatial pattern and the second paint layer is applied.
EP86110357A 1985-07-31 1986-07-26 Heat-embossable multilayered film, and method of making it Expired - Lifetime EP0210619B1 (en)

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US4897533A (en) * 1987-07-07 1990-01-30 National Business Systems, Inc. Credit card and method of making the same
EP0399600A1 (en) * 1989-05-25 1990-11-28 Stork X-Cel B.V. Process for manufacturing a product composed of polyurethane layers
EP0408896A1 (en) 1989-07-19 1991-01-23 Landis & Gyr Business Support AG Device for applying thermo-adhesive labels
EP0412492A2 (en) * 1989-08-11 1991-02-13 Leonhard Kurz Gmbh & Co. Embossing foil, in particular hot embossing foil
WO1994005483A1 (en) * 1992-09-03 1994-03-17 Leonhard Kurz Gmbh & Co. Method and machine for laminating a decorative layer to the surface of a three-dimensional object
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WO1994025288A1 (en) * 1993-04-24 1994-11-10 Leonhard Kurz Gmbh & Co. Decorative covering structure and its use
EP1294576B2 (en) † 2000-06-28 2017-11-22 De La Rue International Limited A security device
DE102005006074A1 (en) * 2005-02-10 2006-08-17 Leonhard Kurz Gmbh & Co. Kg Multilayer film, injection molded article decorated therewith and method of making the decorated injection molded article
DE102005006074B4 (en) * 2005-02-10 2009-12-10 Leonhard Kurz Gmbh & Co. Kg Decorated injection molded article and method of making the decorated injection molded article
US7976931B2 (en) 2005-02-10 2011-07-12 Leonhard Kurz Stiftung & Co. Kg Multi-layer film, injection molded article decorated therewith and process for the production of the decorated injection molded article

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JPH0535872B2 (en) 1993-05-27
DE3527412A1 (en) 1987-02-12
DE3527412C2 (en) 1989-03-23
EP0210619A3 (en) 1988-05-04
HK14893A (en) 1993-03-05
EP0210619B1 (en) 1990-05-23
JPS6242179A (en) 1987-02-24
SG120592G (en) 1993-01-29
ATE52963T1 (en) 1990-06-15
US4717615A (en) 1988-01-05

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